Distance and frequency physics problem?

Two small speakers A and B are driven in step at 745 Hz by the same audio oscillator. These speakers both start out 4.50 m from the listener, but speaker A is slowly moved away. (See the figure (Figure 1)). The speed of sound in air is 344 m/s.

At what distance d will the sound from the speakers first produce destructive interference at the location of the listener?

If A keeps moving, at what distance d will the speakers next produce destructive interference at the listener?

After A starts moving away, at what distance will the speakers first produce constructive interference at the listener?

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